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DeviceNet Connections Appendix B
The following diagram shows the transmission timing. After the COS send instruction has been sent to the
DeviceNet (at the I/O refresh timing for the CPU Unit), the COS transmission is executed to each slave immedi-
ately after the refresh (remote I/O communications), which each slave is performed during the communications
cycle. Therefore, when there are a lot of destination slaves, the COS send timing may be delayed in order of
the node addresses.
DeviceNet Unit
Multiple COS send switches (node address #1, #2, #3) turned OFF to ON
I/O refresh
Time
COS send instruction
Node #1 Node #2 Node #3 Node #4 Node #1
COS
#1
Node #2
COS
#2
Node #3
COS
#3
Node #4
Communications cycle time Communications cycle time
Slave # 1
Slave # 2
Slave # 3
: I/O using normal connection
: Output using COS (sent to fit in between
normal cycles)
CPU Unit user
program